Last spring frost
Jun 4
Frost Dates for Igiugig, AK
First fall frost
Sep 12
Growing season
98 days
In an average year around Igiugig, AK, the last spring frost (32°F) is about Jun 4 and the first fall frost is about Sep 12, giving roughly a 98-day growing season. To be safe most years, wait until May 18 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Freeze (32°F) | Jun 22 | Jun 4 | May 18 |
| Hard (28°F) | Jun 8 | May 20 | Apr 29 |
| Severe (24°F) | May 20 | May 1 | Apr 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Jun 22 | Jun 17 | Jun 13 | Jun 8 | Jun 4 | Jun 1 | May 29 | May 25 | May 18 |
| 28°F | Jun 8 | Jun 1 | May 28 | May 24 | May 20 | May 15 | May 10 | May 4 | Apr 29 |
| 24°F | May 20 | May 14 | May 9 | May 5 | May 1 | Apr 28 | Apr 23 | Apr 19 | Apr 13 |
| 20°F | May 6 | Apr 30 | Apr 26 | Apr 22 | Apr 18 | Apr 14 | Apr 11 | Apr 7 | Apr 3 |
| 16°F | Apr 25 | Apr 20 | Apr 15 | Apr 12 | Apr 9 | Apr 6 | Apr 4 | Apr 2 | Mar 29 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Freeze (32°F) | Aug 28 | Sep 12 | Oct 1 |
| Hard (28°F) | Sep 6 | Sep 26 | Oct 15 |
| Severe (24°F) | Sep 21 | Oct 7 | Oct 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Aug 28 | Sep 1 | Sep 5 | Sep 8 | Sep 12 | Sep 17 | Sep 21 | Sep 26 | Oct 1 |
| 28°F | Sep 6 | Sep 12 | Sep 18 | Sep 22 | Sep 26 | Sep 29 | Oct 2 | Oct 7 | Oct 15 |
| 24°F | Sep 21 | Sep 27 | Oct 1 | Oct 4 | Oct 7 | Oct 11 | Oct 16 | Oct 21 | Oct 29 |
| 20°F | Oct 1 | Oct 5 | Oct 10 | Oct 15 | Oct 19 | Oct 23 | Oct 28 | Nov 1 | Nov 10 |
| 16°F | Oct 8 | Oct 16 | Oct 21 | Oct 25 | Oct 30 | Nov 1 | Nov 6 | Nov 12 | Nov 20 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Intricate Bay, Ak, about 45.6 miles away@if(!empty($station['elevation_ft'])), at 120 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Igiugig, AK?
On average, the last spring frost (32°F) around Igiugig, AK is about Jun 4. In cooler years it can run later, so for a safer bet many gardeners wait until May 18.
When is the first frost in the fall?
The first fall frost around Igiugig, AK typically arrives about Sep 12. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Jun 4 on average, or May 18 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 98 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 99613 Planting calendar → Alaska frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026